Cut the chicken into small bite size pieces about 1" cubes and season with salt and pepper. Slice the peppers into round or thin strips if you are using a regular size bell pepper. Dice the onion into ¼" dice. Peel 6 cloves of garlic.
Add the onions, peppers, garlic to the inner pot. Cut about 1" off the ends of the fettuccine noodles and fan them in a criss cross fashion in the pot.
Spread the cubed chicken on top. Place the butter on top of the chicken. Pour in the 2 cups of chicken stock. Put on the pressure lid and turn the valve to seal. Set the pressure to high for 2 minutes. When the time is up, immediately release the pressure.
Turn the sear/sauté on high. Toss the fettuccine noodles around in the pot to loosen them up. They will be undercooked at this point, but will finish cooking during the sear/sauté and resting time.
Add in the grated cheese and stir to combine. It might clump at first, but will smooth out. Reduce the heat to medium and add in the cream. Mix until combined. Add in the spinach if using and toss so the spinach is under the pasta. The mixture will look runny, no worries. Turn the heat off and close the crisping lid. Let sit 5-10 minutes. Mix well and serve!
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